X-ray photoemission and absorption spectroscopy of a hypervalent iodine compound, 2-iodosobenzoic acid

Abstract

To apply a hypervalent iodine compound, 2-iodosobenzoic acid (IBA), to a protecting group of X-ray activated caged compounds, X-ray photoemission and absorption spectroscopy of IBA were performed. The photoemission spectrum of IBA in the valence band region included a component originating from the π*-like orbitals of I-C and I-O. Such characteristic electronic structures may cause the reactivities of IBA. The linear absorption coefficients of the peaks in the iodine K-edge energy region were 38.8, 40.0, and 39.41 cm−1 at around 33.18, 33.23, and 33.32 keV, respectively. Those contribute to discussing reactions of IBA induced by the iodine K-shell excitations quantitatively.